求答要过程(1) (3x-y)(-y+3x) (2)(2x+1)^2-(2

1、x(x-y)(x+y)-x(x+y)^2 (3x+y)二次方-3(3x-y)(x+y)-(x-2y)(x+3y)要过程! 先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y 因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)( 计算(2x+y)(3x-2y) 要过程 （3x+y)(x-2y)计算要过程 (1)(x^2/x)-y-x-y (3x-y)^2+(3x+y)(3x-y),x=1,y=-2 （x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3) {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 化简求值,要详细过程[(y-2x)(-2x-y)-4(x-2y)^2]÷3y,其中x=1,y=-2 化简求值,要详细过程[(y-2x)(-2x-y)-4(x-2y)²]÷3y,其中x=1,y=-3